Within the UK and Ireland, the surname Olsen most frequently occurs in Wales where it is carried by 1 in 12,918 people. The majority of those with the family name of Olsen are to be found living in/around Caerphilly County Borough (approx. 2% of all UK Olsen's), City and County of Cardiff and City and County of Newport. The name can also be found in England with 1 in 25,869 people using it.
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